https://answers.axonivy.com/questions/3369/how-to-implement-primefaces-treetable-selection-checkboxtreenode-in-axon-ivy-7-0-1<p>Hi,</p> <p>I have tried to implement Primefaces TreeTable - Selection (CheckboxTreeNode) The sample code are obtained from <a href="https://www.primefaces.org/showcase/ui/data/treetable/selection.xhtml">https://www.primefaces.org/showcase/ui/data/treetable/selection.xhtml</a> . In Axon Ivy 7.0.1 but it keeps getting the following error when I tried to navigate the tree. </p> <pre><code>ELException: Cannot convert [[Lorg.primefaces.model.TreeNode;@7d8d3a6a] of type [class [Lorg.primefaces.model.TreeNode;] to [class org.primefaces.model.CheckboxTreeNode] ContextAwareELException: javax.el.ELException: Cannot convert [[Lorg.primefaces.model.TreeNode;@7d8d3a6a] of type [class [Lorg.primefaces.model.TreeNode;] to [class org.primefaces.model.CheckboxTreeNode] Error during rendering of html dialog 'trial.TreeDataTryOut' </code></pre> <p>I did some googlings and someone suggested that it is due to PrimeFaces JAR files conflict. I have no idea how to resolve that in Axon Ivy. Could you help?</p> <p>Also, it would be great if there are sample Axon Ivy projects with TreeDataTable - Checkbox for reference?</p>enTue, 31 Jul 2018 02:13:36 -0400https://answers.axonivy.com/questions/3369/how-to-implement-primefaces-treetable-selection-checkboxtreenode-in-axon-ivy-7-0-1/3379<p>Hi Reguel, I found the problem and it was due to declaring selected nodes as TreeNode instead of TreeNode[] in the data class. hence, I created managed bean with TreeNode[] as the selectedNodes. By the way, I also realise we cannot declare Array in the data class. I have tried using List &lt;treenode&gt; but it still cause the same conversion error. Anyway, Thanks for the help.</p>wesingTue, 31 Jul 2018 02:13:36 -0400https://answers.axonivy.com/questions/3369/how-to-implement-primefaces-treetable-selection-checkboxtreenode-in-axon-ivy-7-0-1/3379